Mobile phones are very popular globally, with over 6 billion subscribers. Mobile research utilizes smartphones and mobile technologies to understand behaviors and opinions in context. There are different approaches like SMS/text surveys, mobile optimized web surveys, web apps, and native apps, each with pros and cons. Engagement is key for mobile research as tasks need to be short but frequent to maintain participant interest over time. Mobile research works best combined with other methods and when focused on understanding moments in real-world contexts like decisions, shopping journeys, or reactions to events.